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Electrical Engineering Quiz

Total questions: 51

Worksheet time: 26mins

Name
Class
Date
1.

A transformer has an input power of 20kW and power losses of 920W, the overall efficiency is

a)

a) 9.4%

b)

b) 94.5%

c)

c) 95.4%

d)

d) 9.5%

2.

What is this component?

a)

a) A transistor

b)

b) A triac

c)

c) A diac

d)

A thyristor

3.

An arrow appearing through an electronic symbol means the device is:

a)

a) Preset

b)

b) Light emitting

c)

c) Variable

d)

d) Fixed

4.

A conductor is placed in a static magnetic field and a current is passed through it. The force exerted on it can be calculated by

a)

a) F = BLV

b)

b) F = BIL

c)

c) F = ma

d)

d) F = mg

5.

M_ is the abbreviation used for:

a)

a) Microhms

b)

b) Milli-Ohms

c)

c) Megohms

d)

d) Meggerohms

6.

A length of copper wire has resistance 8 Ω. What would be the resistance if the length was halved and the cross sectional area doubled:

(a)  

7.

A 9V battery is connected across a set of resistors in series, values being: 3 Ω, 12 Ω, 160Ω and 68 Ω. The current flowing in the circuit is:

a)

a) 233A

b)

b) 2097A

c)

c) 25.89A

d)

d) 37mA

8.

A power supply has four diodes connected in ‘bridge’ after the transformer. Is this called a:

a)

Half wave rectifier

b)

Full wave rectifier

c)

Full wave smoother

d)

Half wave smoother

9.

What is this rule and where is it used?

a)

Left hand rule, motors

b)

Right hand rule, generators

c)

Left hand rule, generators

d)

Right hand rule, motors

10.

What is the SI unit for magnetic flux?

a)

Tesla

b)

Coulomb

c)

Angstrom

d)

Weber

11.

What is the function of a dielectric within a capacitor

a)

Holds electric charge

b)

Connects the electric charge to outside circuits in two places

c)

Acts as an insulator between the charged plates

d)

Allows the flow of electrons in pairs

12.

Identify this electronic component

a)

Diode

b)

Transistor

c)

Thyristor

d)

Resistor

13.

The direction of a magnetic field surrounding a current-carrying conductor can be found using which rule?

a)

Fleming’s right hand rule

b)

Fleming’s left hand rule

c)

Maxwell’s corkscrew rule

d)

Lenz’s Law

14.

The insulation resistance of two circuits is 40MΩ and 36MΩ respectively. When tested together what is the total insulation resistance:

a)

60MΩ

b)

0.125MΩ

c)

22MΩ

d)

18.94MΩ

15.

What symbol is this:

a)

Diode

b)

Zener Diode

c)

Photodiode

d)

Photocell

16.

A 230V AC supply has an RMS voltage of:

a)

163V

b)

325V

c)

400V

d)

230V

17.

An electronic device that alters its value to different levels of light is:

a)

A photo transistor

b)

An opto coupler

c)

A fibre optic link

d)

A capacitor

18.

The peak-to-peak voltage of a sinusoidal waveform is:

a)

1/2 x peak value

b)

The peak value

c)

2 x peak value

d)

4 x peak value

19.

An electronic component has the following connections: Base, Collector and Emitter. The component is:

a)

A transistor

b)

A triac

c)

A diac

d)

A thyristor

20.

The following resistors are connected in series to a 230V supply: 12Ω, 24Ω, 48Ω. Calculate the current taken by the 48Ω resistor.

a)

84A

b)

0.36A

c)

2.74A

d)

48A

21.

A conductor of length 1m is placed in a static magnetic field of strength 10mT and a current of 2A is passed through it. Calculate the force exerted on it

a)

20N

b)

2N

c)

0.2N

d)

0.02N

22.

Which of the following is the RMS value for an a.c. voltage having a peak value of 325V:

a)

415V

b)

460V

c)

230V

d)

400V

23.

A steady current of 2.5 A flows for 90 seconds into a capacitor, calculate how much charge has been accumulated on the plates of the capacitor:

a)

0.0278C

b)

3.75

c)

225C

d)

92.5C

24.

Three resistors of value 10Ω, 12Ω and 48Ω are connected in parallel with a voltage supply of 24V DC. Calculate the volt drop across the 10Ω resistor:

a)

0.167V

b)

4V

c)

12V

d)

24V

25.

What is Fleming's right hand rule mainly used for:

a)

Generators

b)

Force on a current carrying conductor in a static magnetic field

c)

Motors

d)

Transformers

26.

A circuit consists of three resistors in series, of values 18Ω, 26Ω and 42Ω, connected in series to a 24V supply, determine the power dissipated by the whole circuit:

a)

6.7W

b)

86W

c)

0.28W

d)

4864W

27.

Which of the following devices work as a result of mutual induction:

a)

Solenoid

b)

Transformer

c)

Relay

d)

Contactor

28.

What kind of capacitor is this:

a)

Paper

b)

Electrolytic

c)

Mica

d)

Tantalum bead

29.

Which of the following devices could be used to efficiently detect light and thus be used in a circuit to switch on a light at night-time:

a)

Opto-coupler

b)

Fibre-optic link

c)

Photodiode

d)

LED

30.

What kind of circuit will provide this output wave from an AC supply:

a)

Full-wave rectifier

b)

Rectifier with smoothing

c)

Half-wave rectifier with smoothing

d)

Half-wave rectifier

31.

A Coulomb is:

a)

Rate of flow of electrons

b)

Rate of flow of protons

c)

Quantity of charge

d)

All the above

32.

Calculate the resistance of 125m of 1.5mm² Aluminium wire given the resistivity of Aluminium is 28.5 x 10⁻⁹ Ω/m:

a)

3.42Ω

b)

5.34pΩ

c)

2.375Ω

d)

6578.94Ω

33.

A dc current of 0.6A flows for 300ms into a capacitor, what is the charge:

a)

2C

b)

0.36C

c)

0.18C

d)

4C

34.

For the lines of magnetic flux shown here to exist between two magnets, what must the magnetic poles be at A and B, respectively:

a)

South North

b)

South South

c)

North North

d)

North South

35.

What is this rule simply used for in magnetism:

a)

Finding the direction of the traffic on a busy road.

b)

Finding the direction of the Magnetic Field in a conductor.

c)

Finding the direction of Force, Field and Current in generators.

d)

Finding the direction of Motion, Field and Current in motors.

36.

Calculate the Flux density of a bar magnet whose magnetic flux is 781.25μWb with a square section of material of 25mm x 25mm.

a)

32T

b)

32mT

c)

125T

d)

1.25T

37.

A conductor of length 3m is placed inside a static magnetic field of strength 5mT and a current of 0.5A is passed through it. Calculate the force exerted on it:

a)

7.5mN/m

b)

7.5N/m

c)

30mN/m

d)

0.83mN/m

38.

The peak voltage of a sinusoidal waveform is 566V, what is the RMS voltage:

a)

566V

b)

400V

c)

283V

d)

200V

39.

To operate in forward bias, a diode will conduct when a positive voltage is applied to the:

a)

Anode

b)

Cathode

c)

Gate

d)

Base

40.

Three resistors, all of value 6Ω are connected in a series and parallel combination, giving an equivalent resistance of 9Ω. How are they connected:

a)

All in series

b)

All in parallel

c)

Two in series, which are then connected in parallel with the third

d)

Two in parallel, which are then connected in series with the third

41.

What electronic component is represented by this circuit symbol:

a)

Capacitor

b)

Variable Capacitor

c)

Electrolytic Capacitor

d)

Battery

42.

Which electronic component does this symbol represent:

a)

Diode

b)

Triac

c)

Transistor

d)

LDR

43.

What is the peak-to-peak value for an AC voltage having an RMS value of 400V:

a)

566V

b)

283V

c)

400V

d)

1132V

44.

What does this symbol represent:

a)

Variable Resistor

b)

Thermion

c)

An American fuse

d)

Thermistor

45.

What is this component:

a)

Choke

b)

Axial electrolytic capacitor

c)

Ceramic resistor

d)

Ceramic inductor

46.

A conductor of length 0.7m is placed in a static magnetic field of density 0.4mT and a current of 0.9A is passed though it. Calculate the force exerted on it:

a)

2.52N

b)

252mN

c)

252μN

d)

25.2N

47.

A 400V AC supply has an RMS voltage of:

a)

400V

b)

566V

c)

360V

d)

230V

48.

Which of these is NOT an effect of the flow of electric current in a conductor:

a)

Radioactive

b)

Thermal

c)

Magnetic

d)

Chemical

49.

A steady current of 50mA flows for 6 minutes into a capacitor when 9V is applied, how much charge will accumulate on the plates of the capacitor:

a)

18C

b)

0.3C

c)

162C

d)

3600C

50.

A transformer has an input power of 15kW and power losses of 640W, the overall efficiency is:

a)

95.7%

b)

100%

c)

99.9%

d)

4.3%

51.

Which direction will this conductor move:

a)

Left

b)

Right

c)

Up

d)

Down